Total bridges
244
Public highway bridges in Allegan County
County profile · official public datasets
Allegan County, MI
244 public highway bridges tracked in the FHWA National Bridge Inventory: 24.2% rated Good, 59% Fair, 16.8% Poor.
- 244
- Public bridges
- 24.2%
- Good condition
- 16.8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Allegan County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 65th
- of 83 on Poor share
- 16.8%
- Poor-condition share
- 244
- public highway bridges
- 1978
- avg year built
Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.
Allegan County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Allegan County ranks #65 of 83 Michigan counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 16.8%). Allegan County, Michigan contains 244 public highway bridges. Roughly 24.2% are rated “Good,” 59% “Fair,” and 16.8% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Good condition
24.2%
59 of 244 rated 7-9
Fair condition
59%
144 of 244 rated 5-6
Poor condition
16.8%
41 of 244 rated 4 or below
In-state Poor-share rank
#65 of 83
Among Michigan counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 244 NBI-tracked bridges by lowest applicable component rating.
Good 24.2% (59)
Fair 59% (144)
Poor 16.8% (41)
Allegan County's Poor-condition bridges carry 81,607 vehicle crossings a day
That is 8.8% of the county's reported daily bridge traffic on 16.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,990 crossings a day against 2,254 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.
Computed over the 244 of 244 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
51.2% of Allegan County's bridges have passed the 50-year mark
125 of the 244 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 24.2% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.
Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.
One structure carries 34.2% of the county's Poor-condition bridge traffic
US-131 SB over GRAND ELK RR, built 1960, carries 27,941 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 41-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 81,607 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Allegan County's bridges were built
244 bridges with a recorded construction year, grouped by decade
- pre-1900 1
Built before 1900
1 bridges
- 1920s 4
1920–1929
4 bridges
- 1930s 6
1930–1939
6 bridges
- 1940s 4
1940–1949
4 bridges
- 1950s 14
1950–1959
14 bridges
- 1960s
1960–1969
44 bridges
- 1970s
1970–1979
76 bridges
- 1980s
1980–1989
34 bridges
- 1990s 17
1990–1999
17 bridges
- 2000s 20
2000–2009
20 bridges
- 2010s 20
2010–2019
20 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 1970s, when 76 of the county's bridges still in the inventory were built, which is 31.1% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1978) matches the Michigan average (1976).
How Allegan County compares with Michigan's closest counties by inventory size
The 5 Michigan counties nearest Allegan County in number of bridges, with their condition splits. Its 16.8% Poor share is the 5th-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1977 is in line with the group.
Showing the 5 closest of 82 Michigan counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Washtenaw County | 262 | 23.3% | 56.5% | 20.2% | 1975 |
| Ottawa County | 254 | 40.9% | 52.8% | 6.3% | 1977 |
| Allegan County (this page) | 244 | 24.2% | 59% | 16.8% | 1978 |
| Tuscola County | 242 | 33.9% | 61.2% | 5% | 1980 |
| Ingham County | 241 | 15.8% | 68.9% | 15.4% | 1972 |
| Lenawee County | 225 | 47.6% | 39.6% | 12.9% | 1981 |
Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Allegan County's. Source: FHWA National Bridge Inventory, 2024 release.
Nationwide counties with similar inventory size or average build year
Two NBI-derived peer sets for Allegan County, both outside Michigan so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside MI (244 bridges here).
- Spencer County, IN · 244 bridges
- Norton County, KS · 244 bridges
- Osborne County, KS · 244 bridges
- Seward County, NE · 244 bridges
Similar average build year
Nearest mean year-built outside MI (1978 here).
- Orange County, CA · avg 1978 · 1,164 bridges
- Sumner County, KS · avg 1978 · 659 bridges
- Allen County, IN · avg 1978 · 613 bridges
- Livingston County, IL · avg 1978 · 579 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (144)
BRIDGE STREET
FairOver: KALAMAZOO RIVER MILL BR
IN PLAINWELL, Allegan, MI
Built 1975 Load: 33.4 t ADT: 600
M-89
FairOver: KALAMAZOO RIVER
1.4 MI W OF OTSEGO, Allegan, MI
Built 1930 Load: 33.7 t ADT: 11,469
26TH STREET
FairOver: RABBIT RIVER
JUST N OF 138TH AVE, Allegan, MI
Built 1976 Load: 33.7 t ADT: 432
130 AVENUE
FairOver: BEAR CREEK
0.1 MI E OF 22ND STREET, Allegan, MI
Built 1977 Load: 33.7 t ADT: 714
I-196 E & US-31 N
FairOver: 71 ST STREET
3.0 MI N OF VAN BUREN COL, Allegan, MI
Built 1963 Load: 34.0 t ADT: 10,500
142ND AVE
FairOver: BLACK CREEK DRAIN
APPROX 0.25 MI E OF 38TH, Allegan, MI
Built 1970 Load: 34.3 t ADT: 2,208
130 TH AVE
FairOver: I-196 & US-31
IN DOUGLAS, Allegan, MI
Built 1964 Load: 34.7 t ADT: 360
65TH STREET
FairOver: M BR BLACK RIVER
CASCO TWP SEC 27, Allegan, MI
Built 1982 Load: 34.7 t ADT: 34
68TH STREET
FairOver: M BR BLACK RIVER
CASCO TWP SEC 32-33, Allegan, MI
Built 1982 Load: 34.7 t ADT: 78
109 TH AVE
FairOver: I-196 & US-31
5.0 MI N OF VAN BUREN COL, Allegan, MI
Built 1963 Load: 35.0 t ADT: 2,030
124 TH AVE
FairOver: US-131
10.0 MI N OF PLAINWELL, Allegan, MI
Built 1959 Load: 35.0 t ADT: 2,482
28TH STREET
FairOver: BASELINE CREEK
APPROX 0.1 MI S OF 101STA, Allegan, MI
Built 1979 Load: 35.0 t ADT: 203
US-131 NB
FairOver: KALAMAZOO RIVER
0.5 MI N OF PLAINWELL, Allegan, MI
Built 1996 Load: 35.3 t ADT: 27,941
US-131 SB
FairOver: KALAMAZOO RIVER
0.5 MI N OF PLAINWELL, Allegan, MI
Built 1996 Load: 35.3 t ADT: 27,941
112TH AVE
FairOver: GUN RIVER
APPROX 0.10 MI E OF 2ND S, Allegan, MI
Built 1970 Load: 35.3 t ADT: 438
106TH AVE
FairOver: GUN RIVER
JUST EAST OF HILL ROAD, Allegan, MI
Built 1971 Load: 35.6 t ADT: 3,322
US-31 SB
FairOver: US-31 BR (58 TH STREET)
IN HOLLAND, Allegan, MI
Built 1964 Load: 36.3 t ADT: 8,602
60 TH STREET
FairOver: US-31
0.5 MI W OF HOLLAND, Allegan, MI
Built 1964 Load: 36.6 t ADT: 1,877
US-131 NB
FairOver: GRAND ELK RR
6.0 MI N OF WAYLAND, Allegan, MI
Built 1958 Load: 36.6 t ADT: 18,376
US-131 SB
FairOver: GRAND ELK RR
6.0 MI N OF WAYLAND, Allegan, MI
Built 1958 Load: 36.6 t ADT: 18,376
55TH STREET
FairOver: SCOTT CREEK
LEE TWP SEC 9, Allegan, MI
Built 1979 Load: 36.6 t ADT: 538
62ND STREET
FairOver: SPICEBUSH CREEK
70 FT S OF 104TH AVE, Allegan, MI
Built 1975 Load: 36.6 t ADT: 353
60 TH STREET
FairOver: I-196
6.0 MI SW OF OTTAWA COL, Allegan, MI
Built 1972 Load: 36.9 t ADT: 1,877
146 TH AVE
FairOver: I-196
1.2 MI S OF OTTAWA COL, Allegan, MI
Built 1972 Load: 37.3 t ADT: 1,893
136TH AVENUE
FairOver: RABBIT RIVER
DORR TWP SEC 31, Allegan, MI
Built 1993 Load: 37.3 t ADT: 170
I-196 E & US-31 N
FairOver: KALAMAZOO RIVER
IN SAUGATUCK, Allegan, MI
Built 1964 Load: 37.6 t ADT: 24,400
120TH AVENUE
FairOver: LEVERIDGE DRAIN
CLYDE TWP SEC 7-18, Allegan, MI
Built 1993 Load: 37.6 t ADT: 53
LINCOLN AVE
FairOver: N BR BLACK RIVER
IN HOLLAND, Allegan, MI
Built 1986 Load: 37.6 t ADT: 2,482
56 TH STREET
FairOver: I-196
3.9 MI SW OF OTTAWA COL, Allegan, MI
Built 1972 Load: 37.9 t ADT: 1,819
142ND AVE
FairOver: LITTLE RABBIT RIVER
APPROX 0.15 MI E OF 30TH, Allegan, MI
Built 1971 Load: 37.9 t ADT: 6,984
N NORTH STREET
FairOver: KALAMAZOO RIVER
IN OTSEGO, Allegan, MI
Built 1980 Load: 37.9 t ADT: 1,500
OLD US-31
FairOver: I-196 & US-31
8.0 MI N OF VAN BUREN COL, Allegan, MI
Built 1964 Load: 38.2 t ADT: 8,400
58TH STREET
FairOver: KALAMAZOO RIVER
APPROX 0.6 MI S 132 AVE, Allegan, MI
Built 1974 Load: 38.2 t ADT: 6,042
I-196 BL (N SHORE)
FairOver: I-196 & US-31
0.5 MI N OF VAN BUREN COL, Allegan, MI
Built 1963 Load: 38.6 t ADT: 8,400
21ST STREET
FairOver: PINE CREEK
JUST SOUTH OF 102ND AVE, Allegan, MI
Built 1968 Load: 38.6 t ADT: 1,565
136TH AVE
FairOver: RABBIT RIVER
APPROX 0.15 MI W OF 12TH, Allegan, MI
Built 1971 Load: 38.6 t ADT: 112
OLD US-31
FairOver: I-196 & US-31
2.0 MI NE OF SAUGATUCK, Allegan, MI
Built 1964 Load: 38.9 t ADT: 9,016
M-89
FairOver: KALAMAZOO RIVER
6.0 MI E OF FENNVILLE, Allegan, MI
Built 1950 Load: 39.2 t ADT: 4,200
66TH STREET
FairOver: N BR BLACK RIVER
APPROX 0.75 MI N OF 109TH, Allegan, MI
Built 1973 Load: 39.2 t ADT: 396
US-31 BR (58 TH)
FairOver: N BR MACATAWA RIVER
S LTS OF HOLLAND, Allegan, MI
Built 2011 Load: 39.5 t ADT: 6,350
12TH STREET
FairOver: RABBIT RIVER
JUST N OF 136TH AVE, Allegan, MI
Built 1969 Load: 39.5 t ADT: 380
22ND STREET
FairOver: SCHNABLE BROOK
OTSEGO TWP SEC 5-6, Allegan, MI
Built 2003 Load: 39.5 t ADT: 130
118TH AVE
FairOver: LEVERIDGE DRAIN
APPROX 1.0 MI W OF 58TH S, Allegan, MI
Built 1970 Load: 39.9 t ADT: 833
BLUE STAR HWY
FairOver: KALAMAZOO RIVER
BTWN SAUGATUCK - DOUGLAS, Allegan, MI
Built 1937 Load: 40.2 t ADT: 9,000
M-89
FairOver: I-196 & US-31
12 MI N OF VAN BUREN COL, Allegan, MI
Built 1964 Load: 40.5 t ADT: 2,817
128TH AVE
FairOver: MILLER CREEK
APPROX 0.20 MI W OF 20 ST, Allegan, MI
Built 1972 Load: 40.5 t ADT: 2,555
106 TH AVE
FairOver: US-131
1.0 MI NW OF PLAINWELL, Allegan, MI
Built 1960 Load: 40.8 t ADT: 2,548
M-89
FairOver: KALAMAZOO RIVER
IN THE CITY OF ALLEGAN, Allegan, MI
Built 1943 Load: 42.1 t ADT: 12,100
US-31 BR (58 TH)
FairOver: US-31 NB
IN HOLLAND, Allegan, MI
Built 1964 Load: 42.4 t ADT: 12,892
58 TH STREET
FairOver: I-196
4.9 MI SW OF OTTAWA COL, Allegan, MI
Built 1972 Load: 42.4 t ADT: 7,959
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.